11212202121 has 16 divisors (see below), whose sum is σ = 14983076736. Its totient is φ = 7458085376.

The previous prime is 11212202107. The next prime is 11212202123. The reversal of 11212202121 is 12120221211.

It is a cyclic number.

It is not a de Polignac number, because 11212202121 - 2¹¹ = 11212200073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11212202121.

It is not an unprimeable number, because it can be changed into a prime (11212202123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4931641 + ... + 4933913.

It is an arithmetic number, because the mean of its divisors is an integer number (936442296).

Almost surely, 2^11212202121 is an apocalyptic number.

It is an amenable number.

11212202121 is a deficient number, since it is larger than the sum of its proper divisors (3770874615).

11212202121 is a wasteful number, since it uses less digits than its factorization.

11212202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5232.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11212202121 its reverse (12120221211), we get a palindrome (23332423332).

The spelling of 11212202121 in words is "eleven billion, two hundred twelve million, two hundred two thousand, one hundred twenty-one".